Searching for links to family names

I know that my family is related to several Acostas in the East Texas area.My grandmother's name is Elma Martinez, and she is my link to the Acosta family.She has a twin brother named Elmo Martinez.The Acosta's I know would be cousins, but I feel that there is such history within the family.The Acosta's are also linked to the Martinez, Arriola, Y'barbo, Morales, Manchack, Lazarine, and many other families.If you have any information that may prove useful, I would greatly appreciate it.